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Novel optical properties and induced magnetic moments in Ru-doped hybrid improper ferroelectric Ca3Ti2O7

Published

Author(s)

Sing S. Wu, Wei Fang Liu, Winnie Wong-Ng, Qiang Gu, Jiang Yao, Chao Wang, Shuang Ma, Shouyu Wang

Abstract

Hybrid improper ferroelectric Ca3Ti2O7 and Ca3Ti1.9Ru0.1O7 ceramics were successfully synthesized by conventional solid-state reaction method. Two strongest diffraction peaks located around 2θ = 33° shifted towards the lower angle region with Ru substitution, reflecting structure variation. Grain growth and higher oxygen vacancy concentration after doping resulted in a reduction in the coercive field about 20 kV/cm. Optical bandgap estimated by UV−vis diffuse reflectance (DR) spectrum and X-ray photoelectron spectroscopy (XPS) valence band spectra showed a decreasing trend due to the existence of impurity energy level upon Ru doping, which was consistent with the results of first-principles calculations. The origin of the unexpected induced magnetic moments in Ru-dope Ca3Ti2O7 is also discussed.
Citation
Journal of Advanced Ceramics
Volume
10
Issue
1

Keywords

oxides, electronic materials, optical properties, X-ray diffraction, defects, electronic structure, ferroelectricity

Citation

Wu, S. , Liu, W. , Wong-Ng, W. , Gu, Q. , Yao, J. , Wang, C. , Ma, S. and Wang, S. (2021), Novel optical properties and induced magnetic moments in Ru-doped hybrid improper ferroelectric Ca3Ti2O7, Journal of Advanced Ceramics, [online], https://doi.org/10.1007/s40145-020-0425-2, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929694 (Accessed May 24, 2024)

Issues

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Created June 9, 2021, Updated October 14, 2021